20 Pfg medium ultramarine used APIA German POSTDAMPFSCHIFFSAGENTUR 6 / 4 87 on cover to Cannstatt, reverse manuscript notation "from from Samoa 6 / 4. 87 per Lübeck" as well a print of a Reichsadlersiegels in blue colour, vertical interesting and scarce Bele in remarkable good legitimate condition, certificate with photograph Steuer BPP